<template>
    <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

    <!-- tab 栏区域 -->
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave= "beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_number">
                    <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="catePros" @change="handleChange"></el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的item项 -->
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组 -->
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- action 表示图片要上传到的后台API地址 -->
                <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture"
                    :headers="headerObj"
                    :on-success="handleSuccess"
                    >
                        <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_infroduce"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
    </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'

export default {
    data() {
        return {
            activeIndex: '0',
            //添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                //商品所属的分类数组
                goods_cat: [],
                //图片的数组
                pics: [],
                //商品的详情描述
                goods_infroduce:'',
                attrs: []
            },
            addFormRules:{
                goods_name:[{
                        required:true,message:'请输入商品名称',trigger: 'blur'
                }],
                goods_price:[{
                    required:true,message:'请输入商品价格',trigger: 'blur'
                }],
                goods_weight:[{
                    required:true,message:'请输入商品重量',trigger: 'blur'
                }],
                goods_number:[{
                    required:true,message:'请输入商品数量',trigger: 'blur'
                }],
               goods_number:[{
                   required:true,message:'请选择商品分类',trigger: 'blur'
               }]
            },
            //商品分类列表
            catelist: [],
            catePros:{
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            //动态参数列表数据
            manyTableData: [],
            //静态属性列表数据
            onlyTableData: [],
            //上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible: false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有商品分类数据
        async getCateList(){
            const { data:res } = await this.$http.get('categories')
            
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类数据失败！')
            }
            this.catelist = res.data
            console.log(this.catelist)
        },
        //级联选择器选中项变化会触发此函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的把标签页名字是：' + oldActiveName)
            // console.log('即将进入的把标签页名字是：' + activeName)
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3)
            {
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        async tabClicked(){
            // console.log(this.activeIndex)
            //证明访问的是动态参数面板
            if(this.activeIndex === '1'){
                const { data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params: { sel : 'many'}
                })

                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                console.log(res.data)

                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })

                this.manyTableData = res.data
            }
            else if(this.activeIndex === '2'){
                 const { data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params: { sel : 'only'}
                })

                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        //处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        //处理移除图片的操作
        handleRemove(file){
            //1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            //2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            //3.调用数组的splice方法，把图片信息对象pics数组中移除
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            console.log(response)
            //1.拼接得到一个图片信息对象
            const picInfo = {pic: response.data.tmp_path}
            //2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid){
                    return this.$message.error('请填写必要的表单项！')
                }
                //执行添加的业务逻辑
                //lodash  cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)
                //发起请求添加商品
                //商品名称必须是唯一的
                const { data : res } = await this.$http.post('goods',form)
                
                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败！')
                }

                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin:0 10px 0 0 !important
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>